Answer:
Arm: Supports the tube and connects it to the base.
Base: The bottom of the microscope, used for support.
Explanation:
Revolving Nosepiece or Turret: This is the part of the microscope that holds two or more objective lenses and can be rotated to easily change power (magnification).
Bodytube: which connects the eyepiece to the revolving nosepiece with the objectives.
